Concrete reinforcement.



No. 851.169. O PATBNTBD APR. 2s, 1907.

G. IBAGVK. CONCRETE REINPORGBMBNT.

.APPLICATION FILED APR.20. 1906.

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GEORGE IBACK, OF DETROIT, MICHIGAN.

CONCRETE REINFORCENIENT.

Specification of Letters Patent.

latented April 23, 1907.

Application filed April 20, 1906. Serial No. 312,868.

' To 1J/Z whom it may concern:

Be it known that I, GEORGE IBAOK, a citizen of the United States,residing at Detroit, in the county of Wayne and State of Michigan, haveinvented new and useful Improvements in Concrete Reinforcement, of whichthe following is a specification.

The invention is -a reinforced concrete structure designed particularlyfor use as a beam, girder, or arch, and the object Of the invention isto provide an improved form of metal reinforcement which will beembedded in the concrete and serve to increase the strength and rigiditythereof as well as to bind the concrete together, and thereby increaseits structural strength.

An embodiment of the invention is illustrated in the accompanyingdrawing, in which Figure 1 is a central longitudinal section of a beamprovided with the reinforcement.

Fig. 2 is a side elevation ofthe reinforcing bar and attachments,removed from the concrete. Fig. 3 is an end elevation of the parts shownin Fig. 2. Fig. 4 is a top view Of the same.

The molded or concrete beam, girder or.

other structural element is indicated at 6, and the reinforcement isembedded therein at the time said element is molded. This reinforcementconsists of a metal bar or beam 7 extending lengthwise through theconcrete element and preferably located in the lower part thereof. Thisbar is bound or tied within the concrete by means of metal loops 8, eachof which is formed of a separate rod or piece. The main portion or bodyof the loop is located above the bar, within the concrete, and the saidloops, with respect to the length of the bar, are located on Oppositesides thereof alternately, and they also overlap or extend partly overor beyond each other. They are connected at their ends to the bar'bybeing bent around the lower edge thereof, as at 9, and then the ends areinserted crosswise through holes as at 10 in the bar, the ends orextremities of the rods being extended to project outwardly or laterallyinto the body of the concrete, as at 11. The main part or body of theloops is bent outwardly or laterally at the top to lie beyond thevertical plane of the bar and curved to describe a compound curve whenviewedfrom the top, as indicated in Fig. 4. They thus enclose or bind agreater part of the body of the concrete than if they were located in asingle vertical piane, and thereby serve to prevent or resistlongitudinal split Or breakage of the structure along the line ofthebeam. The structure is further reinforced and strengthened by rods 12,of which there is one on each side, eX- tending longitudinally throughor under the crowns of the loops.

A reinforcement so constructed has great strength and binding qualitiesin proportion to its weight of metal and it may be cheaply constructed,since the reinforcement contains no parts requiring special rolling ormanufacture, the bar being preferably a plain fiat bar punched properly,and the loops and longitudinal rods being formed of ordinary round stockwhich can bereadily bent to proper shape.

I claim:

l. Areinforcement for concrete structure, comprising a metal bar withholes therein, and a series of separate overlapping loops arranged alongand located alternately on opposite sides of the bar, the respectiveends of each loop extending through the holes 'at different points alongthe bar.

2. A reinforcement for concrete structures, comprising a metal bar, aseries of overlapping loops along the same, On Opposite sides thereof,and extending outwardly and laterally at the top, and a rod extendinglengthwise through the loops on the respective sides of the bar.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

GEORGE IBACK.

wfitnesses: l

ELIZABETH J. PRICE, JEssrE A. GORDON.

